CN204609898U - A kind of concrete filled steel tube roadside support system for big cross section gob side entry retaining - Google Patents

Abstract

The utility model provides a concrete-filled steel pipe roadside support system for large-section gob-side entry retention. The system includes a Π-shaped steel beam close to the roof, a steel-filled steel pipe concrete column supporting the Π-shaped steel beam on the roof, and a steel-filled steel pipe concrete column. The lower elliptical ring base, the tilting hydraulic jack with the elliptical ring base as the fulcrum, and its ends support the Π-shaped steel beam and metal mesh filling the wall surface. The truss structure formed by the concrete-filled steel tube columns plays a major role in supporting the roof, and cooperates with the filling wall to control the sinking deformation of the roof. Stability, then the obliquely arranged hydraulic jack takes the elliptical ring base as the fulcrum, which can provide a large force to support the Π-shaped steel beam pressing the metal mesh on the surface of the filling wall. With the further deformation of the roof of the large-section gob-side entry retention, the deformation of its side surface is restricted by the inclined hydraulic jack supporting the Π-shaped steel beam and the metal mesh, and the stress state of the filling wall is improved. At this time, the filling wall supports the roof The effect is significantly enhanced, and it cooperates with the concrete-filled steel tube truss to control the deformation of the roof; when the deformation of the surrounding rock reaches a certain state, the truss structure and the filling wall also tend to be stable, and the two finally form an effective roadside collaborative control system.

Description

A concrete-filled steel tube roadside support system for large-section gob-side entry retention

technical field

The utility model belongs to the technical field of coal mine roadway support, in particular to a steel pipe concrete roadside support system for large-section gob-side roadway retention.

Background technique

Gobside retaining refers to retaining the mining roadway behind the mined working face along the edge of the goaf in a certain way, as the mining roadway of the next working face. The gob-side retaining can not only cancel the section protection coal pillars, improve the recovery rate of coal resources, and relieve the tension of mining replacement, but also realize the "Y" ventilation of the working face, fundamentally solve the problem of gas over-limit and the upper corner of the upper working face. Corner Gas Accumulation Conundrum. So far, my country has done a lot of work on the theory and technology research of gob-side entry retention. The technology of gob-side entry retention in the thin and medium-thick coal seam coal mining face with better conditions has been perfected day by day. The technologies of internal support, reinforced support and coal side reinforcement have become mature, but there are still some technical difficulties in adopting gob-side retaining technology in the medium-thick coal seam or thick coal seam with large cross-section roadways with difficult conditions. For example, in fully mechanized caving mining, large mining height and other conditions of large-section gob-side entry retention, the structure and movement law of the surrounding rock in the stope are significantly different from those of thin and medium-thick coal seams. The damage and instability of the supporting structure beside the lane, especially the filling wall beside the lane.

At present, the filling wall beside the roadway is mainly made of high-water materials and concrete paste materials, and the supporting effect has been greatly improved. However, under the conditions of fully-mechanized caving mining and large mining height, the overlying strata move violently, and the height of the filling wall next to the roadway is relatively high, resulting in relatively poor structural stability. A large number of practices have shown that: there are obvious differences in the mine pressure appearance characteristics of various parts of the filling wall beside the gob-side entry retaining. big. Even if the way of erecting wooden point columns and single hydraulic props in the roadway cannot effectively prevent large-area fracturing chips on the side of the filling wall beside the roadway, the wooden point columns are split or broken, and the single hydraulic props are seriously bent and deformed, which leads to The load-carrying capacity of the filling wall at the side of the roadway is reduced, and it is easy to induce the damage and instability of the roadside support structure, so that some mines do not achieve the expected effect when applying the technology of large-section gob-side entry retention, or even fail to retain the entryway, thus limiting the gob-side entry retention Technology is more widely promoted and applied in our country.

Utility model content

The purpose of this utility model is to overcome the above-mentioned problems in the prior art, and provide a concrete-filled steel tube roadside support system and support method with simple structure, good stability, and suitable for large-section gob-side entry retention.

In order to achieve the above purpose of the utility model, the utility model provides a concrete-filled steel pipe roadside support system for large-section gob-side entry retention. concrete-filled steel pipe column, the elliptical ring base set at the lower part of the steel tube concrete column, and the tilting hydraulic jack with the elliptical ring base as the articulated fulcrum, the tip of the tilting hydraulic jack is supported on the vertical Π-shaped steel beam on the surface of the filling wall and the metal mesh .

The concrete-filled steel pipe column includes 8-inch steel pipes, 5-inch steel pipes, rubber plugs, filled concrete, vertical hydraulic jacks, and ring-type pipe clips.

Among them, the 8-inch steel pipe and the 5-inch steel pipe have the same length, the 5-inch steel pipe is set inside the 8-inch steel pipe, and the axes of the two steel pipes are the same; 2 to 3 horizontal steel bars are welded at both ends to fix the two steel pipes, and one end of the horizontal steel bar is welded on the 8-inch steel pipe. inch steel pipe inner wall, the other end is welded on the outer wall of 5 inch steel pipe to fix the two steel pipes; there are multiple ring-type pipe clips (2 to 4) fixed on the outside of the 8-inch steel pipe, with a certain distance between the ring-type pipe clips, fixed The number and spacing of ring-type pipe clamps are determined according to the length of the 8-inch steel pipe; a rubber stopper is installed in the 5-inch steel pipe 0.3m away from one end of the steel pipe, and the diameter of the rubber stopper matches the inner diameter of the 5-inch steel pipe to block the 5-inch steel pipe; Concrete is filled in the 5-inch steel pipe at the other end and between the 8-inch steel pipe and the 5-inch steel pipe to ensure that the interior is compact.

Wherein, the vertical hydraulic jack is installed on the upper end of the concrete-filled steel pipe column, and its top cover is in contact with the top plate Π-shaped steel beam for supporting the top plate Π-shaped steel beam. The outer diameter of the cylinder matches the inner diameter of the 5-inch steel pipe, and the cylinder will not shake after being inserted into the 5-inch steel pipe without the grouting section. When the height of the roadway is large, the column can be raised to make the top cover contact with the roof Π-shaped steel beam; when the height of the roadway is small, the column can be lowered to make the top cover contact with the roof Π-shaped steel beam to adapt to the roof of different roadway heights Support, the adjustable range is within 0.3m.

The support rod is a steel bar with a diameter of 80mm, and there are card slots at both ends, and a round hole is arranged on the card slot. The round hole matches the diameter of the bolt, and is used for the bolt to pass through and fix; the ring-type pipe clip is a circular steel plate , the inner diameter of the ring-shaped steel plate matches the outer diameter of the 8-inch steel pipe, and can be fixed on the 8-inch steel pipe; there are 4 attachment ears on the edge of the ring-shaped steel plate, and round holes are drilled on the attachment ears for bolts to pass through; the ring shape The lugs on the steel plate can be inserted into the slots at both ends of the support rod, and the round holes on the slot correspond to the round holes on the ring-shaped steel lugs one by one, and then the bolts can be installed to connect the two columns.

Metal mesh is arranged on the surface of the filling wall as a whole, and a Π-shaped steel beam is vertically arranged at a certain interval along the length direction of the filling wall, and the upper end of the vertical Π-shaped steel beam on the filling wall is connected to the Π-shaped top plate. The steel beams are hinged, and the spacing is the same as that of the concrete-filled steel pipe columns. The length of the vertical Π-shaped steel beams is consistent with the height of the filling wall, and is pressed tightly on the metal mesh on the surface of the filling wall.

The concrete-filled steel pipe columns are arranged in two rows along the direction of the roadway on the side close to the filling wall, and the distance between rows = 700×500mm (can be adjusted according to specific conditions), arranged in a staggered step, and the distance between the column closest to the wall and the filling wall 250mm, the roof Π-shaped steel beam arranged on the row of columns is in the shape of a "D", and the vertical hydraulic jack top cover on the two adjacent columns is supported on the two ends of the "D"-shaped roof Π-shaped steel beam, and the third end is connected to the filling The upper ends of the vertical Π-shaped steel beams of the wall are hinged; "one"-shaped Π-shaped steel beams are arranged between the rows of columns farthest from the filling wall.

The elliptical ring base is set on the bottom of the row of concrete-filled steel tube columns far from the filling wall, and is in contact with the bottom plate of the roadway; the elliptical ring base includes an elliptical ring chassis, a tubular end, attached ears and bolts. The outer contour of the elliptical ring chassis is elliptical, and the inner contour is circular, eccentrically arranged on one side of the long axis of the ellipse, and its diameter matches the outer diameter of an 8-inch steel pipe; the tubular end is a short steel pipe, whose inner diameter matches the outer diameter of an 8-inch steel pipe ; The tubular end is aligned with the inner contour of the elliptical ring chassis and welded on the elliptical ring chassis to be inserted into the steel pipe concrete column; the tubular end is welded with a pair of attached ears, and the attached ears extend along the major axis of the ellipse to the major axis On the other side, holes are provided on the attached ears. The bottom of the inclined hydraulic jack is embedded in the middle of the pair of attached ears. The bolt passes through the hole and is fixed with the pair of attached ears to form a hinged structure. The other end of the inclined hydraulic jack is supported obliquely on the On the vertical Π-shaped steel beam on the surface of the filling wall, when the pressure of the top plate is too large, the filling wall is compressed and deformed downwards, and the tip of the inclined hydraulic jack can rotate downwards to ensure sufficient pressure on the filling wall. The supporting force prevents the filling wall from fracturing and falling or moving closer to the roadway. The column and the elliptical ring base are not fixed, and under the pressure of the roof, the elliptical ring base is not affected during the bottoming process of the concrete filled steel pipe column.

The support rods are arranged in such a way that after the same row of concrete-filled steel pipe columns are connected and fixed by support rods, the support rods are on the same horizontal line; since the two rows of steel-filled steel pipe columns are arranged in a staggered step, the support between the two rows of steel-filled steel pipe columns The rods are connected and fixed in a horizontal oblique way, thus forming an isosceles triangle structure formed between every three concrete-filled steel tube columns, and the concrete-filled steel tube columns are all connected and fixed by this method, finally forming a stable truss structure to support the roof .

The control principle of the roadside support system: in the initial stage of the roof of the gob-side entry retention, the truss structure formed by the concrete-filled steel tube column and the filling wall cooperate to control the sinking deformation of the roof, and the truss structure mainly supports the roof. During the intense activity period of the roof of gob-side retaining, the pressure of the roof increases and the amount of subsidence increases. On the one hand, the concrete-filled steel pipe column is grounded to give way to the pressure, which increases the stability of the concrete-filled steel column in the vertical direction, especially the lower part of the concrete-filled column is the most stable, so the inclined hydraulic jack uses the elliptical ring base set at the lower part of the steel-filled column as the fulcrum , a larger force can be applied to support the Π-shaped steel beam on the filling wall. On the other hand, the filling wall is compressed and subsides, and the whole subsides. The hydraulic jack supported on the Π-shaped steel beam of the filling wall uses the elliptical ring base as the pivot point, which not only provides a large supporting force for the Π-shaped steel beam of the filling wall, Moreover, it can also rotate downward with the compression and sinking of the filling wall to adapt to the overall settlement of the filling wall. Then, with the further deformation of the roof of the large-section gob-side entry retention, the compression of the filling wall tends to be stable, and the deformation of its side surface is limited by the inclined hydraulic jack pressing Π-shaped steel beams and metal mesh, and the stress state of the filling wall is improved , at this moment, the supporting effect of the filling wall on the roof is significantly enhanced, and it cooperates with the concrete-filled steel tube truss structure to control the deformation of the roof; Form an effective roadside cooperative control system.

Beneficial effect

After the roadside support is completed, at the initial deformation stage of the roof, the truss structure formed by the concrete-filled steel tube columns plays a major role in supporting the roof, and the filling wall cooperates to control the stability of the roof. , with the further deformation of the roof of the large-section gob-side entry retention, the compression of the filling wall tends to be stable, and the deformation of its side surface is limited by the inclined hydraulic jack, Π-shaped steel beams and metal mesh, and the stress state of the filling wall is improved. At this time, the supporting effect of the filling wall on the roof is significantly enhanced, and it cooperates with the concrete-filled steel tube truss structure to control the deformation of the roof; Effective roadside cooperative control system.

Description of drawings

Fig. 1 is a front view of a concrete-filled steel pipe roadside support system used for large-section gob-side entry retention according to the utility model;

Fig. 2 is the top view along I-I direction among Fig. 1;

Fig. 3 is a schematic diagram of a steel pipe concrete column;

Fig. 4 is the sectional view of II-II direction in Fig. 3;

Fig. 5 is a schematic diagram of connection B-B between the support rod and the concrete filled steel pipe column in Fig. 2;

Fig. 6 is a schematic diagram of the oval ring base A-A in Fig. 1;

Figure 7 is a top view of Figure 6;

Explanation of reference signs: 1- roadway; 2- solid coal side; 3- filling wall; 4- roadway roof; 5- steel pipe concrete column; 51-8 inch steel pipe; 52-5 inch steel pipe; Rubber stopper; 54-filled concrete; 55-vertical hydraulic jack; 56-ring pipe clamp; 561-circular steel plate; 62-round hole on the support rod; 7a-"one"-shaped Π-shaped steel beam on the top plate; 7b-"D"-shaped Π-shaped steel beam on the top plate; 8-tilted hydraulic jack; 9-elliptical ring base; 91-elliptical ring chassis; 92-tubular end; 93-elliptical ring base with ear; 94-bolt; 10-vertical Π-shaped steel beam close to the filling wall; 11-metal mesh;

Detailed ways

According to Fig. 1-Fig. 7, the concrete-filled steel pipe roadside supporting system of the utility model mainly includes Π-shaped steel beams 7a, 7b close to the roof 4, the concrete-filled steel pipe column 5 supporting the Π-shaped steel beam of the roof, and the lower part of the concrete-filled steel tube column 5 The elliptical ring base 9, the tilting hydraulic jack 8 with the elliptical ring base 9 as the fulcrum, the tip of the tilting hydraulic jack 8 is supported on the vertical Π-shaped steel beam 10 and the metal mesh 11 filling the surface of the wall 3 .

The concrete-filled steel pipe column 5 includes an 8-inch steel pipe 51, a 5-inch steel pipe 52, a rubber stopper 53, filled concrete 54, a vertical hydraulic jack 55, and a ring pipe clip 56.

Among them, the 8-inch steel pipe 51 and the 5-inch steel pipe 52 have the same length, the 5-inch steel pipe 52 is set in the 8-inch steel pipe 51, and the axes of the two steel pipes are the same; 2 to 3 horizontal steel bars are welded at both ends to fix the two steel pipes 51, 52 One end of the horizontal steel bar is welded on the inner wall of 8-inch steel pipe 51, and the other end is welded on the outer wall of 5-inch steel pipe 52 to fix the two steel pipes; a plurality of ring-type pipe clips 56 (2 to 4) are fixed outside the 8-inch steel pipe 51, A certain distance is kept between the ring-type pipe clips 56, and the quantity and spacing of the fixed ring-type pipe clips 56 are determined according to the length of the 8-inch steel pipe 51; a rubber stopper 53 and a rubber stopper 53 are installed in the 5-inch steel pipe 52 which is 0.3m away from one end of the steel pipe. Diameter matches with 5 cun steel pipe 52 internal diameters, is used for blocking 5 cun steel pipe 52; Then fills concrete 54 in the 5 cun steel pipe 52 of the other end and between 8 cun steel pipe 51 and 5 cun steel pipe 52, guarantees internal compactness.

Wherein, the vertical hydraulic jack 55 is installed on the upper end of the concrete-filled steel pipe column 5, and its top cover is in contact with the roof Π-shaped steel beams 7a, 7b to support the roof Π-shaped steel beams, and the column tube is inserted into the 5-inch steel pipe 52 of the steel-filled steel tube concrete column. There is no grouting section in the interior, and the outer diameter of the cylinder matches the internal diameter of 5 cun steel pipes 52, and the cylinder can not shake after being inserted into the 5 cun steel pipes 52 without the grouting section. When the height of the roadway is large, the column can be raised to make the top cover contact with the roof Π-shaped steel beams 7a, 7b; To adapt to the roof support of different roadway heights, the adjustable range is within 0.3m.

The support rod 6 is a steel bar with a diameter of 80mm, and there are card slots at both ends, and a round hole 62 is arranged on the card slot, and the round hole 62 matches the diameter of the bolt, and is used for fixing the bolt through; Ring-shaped steel plate 561, the inner diameter of the ring-shaped steel plate 561 matches the outer diameter of the 8-inch steel pipe 51, and can be fixed on the 8-inch steel pipe 51; the edge of the ring-shaped steel plate 561 is provided with 4 attached ears 562, and round holes are drilled on the attached ears 563, used for bolts to pass through; the attached ears 562 on the annular steel plate 561 can be embedded in the slots at both ends of the support rod 6, and the round holes 62 on the slot correspond to the round holes 563 on the attached ears of the annular steel plate, and then install Bolts can connect two columns 5.

Metal mesh 11 is arranged on the surface of the filling wall 3 as a whole, and a Π-shaped steel beam 10 is vertically arranged at a certain interval along the length direction of the filling wall 3, and the vertical Π-shaped steel beam 10 on the filling wall 3 is The upper end is hinged with the "T"-shaped roof Π-shaped steel beam 7b, and its spacing is the same as that of the concrete-filled steel pipe column 5. The length of the vertical Π-shaped steel beam 10 is consistent with the height of the filling wall 3, and is pressed tightly against the metal surface of the filling wall 3. 11 on the net.

The concrete-filled steel pipe columns 5 are arranged in two rows along the direction of the roadway 1 on the side close to the filling wall 3, with the row spacing = 700×500mm (can be adjusted according to specific conditions), arranged in a staggered stepping manner, and the distance between a row of columns closest to the wall The filling wall 3 is 250 mm in length, and the roof Π-shaped steel beam 7b arranged on the row of columns is in the shape of a "D", and the vertical hydraulic jack 55 top cover on the adjacent two columns is supported on the "T"-shaped roof Π-shaped steel beam 7b. The third end is hinged with the upper end of the vertical Π-shaped steel beam 10 of the filling wall 3; a "one"-shaped Π-shaped steel beam 7a is arranged between the row of columns farthest from the filling wall 3.

The elliptical ring base 9 is set on the bottom of the row of concrete-filled steel tube columns 5 far away from the filling wall 3, and is in contact with the roadway floor; the elliptical ring base 9 includes an elliptical ring chassis 91, a tubular end 92, attached ears 93 and Bolt 94. The outer contour of the elliptical ring chassis 91 is an ellipse, and the inner contour is a circle. 51 outer diameter matching; the tubular end 92 is aligned with the inner contour of the elliptical ring chassis 91, and welded on the elliptical ring chassis 91 to be inserted into the steel pipe concrete column 5; the tubular end 92 is welded with a pair of attached ears 93, the The attachment ear 93 extends to the other side of the major axis along the long axis of the ellipse, and holes are provided on the attachment ear 93, and the bottom of the inclined hydraulic jack 8 is embedded in the middle of the pair of attachment ears 93, and the bolt 94 passes through the hole and the pair of attachment ears 93 fixed to form a hinged structure, the other end of the tilting hydraulic jack 8 is tilted and supported on the vertical Π-shaped steel beam 10 on the surface of the filling wall 3, and when the pressure on the top plate 4 is too large, the filling wall 3 is downward Compression and deformation, the end of the inclined hydraulic jack 8 can be rotated downwards to ensure sufficient support for the filling wall 3 and prevent the filling wall 3 from fracturing and falling or moving closer to the roadway. The column 5 and the elliptical ring base 9 are not fixed, and under the pressure of the roof, the elliptical ring base 9 is not affected during the bottoming process of the steel tube concrete column 5 .

The arrangement of the support rods 6 is that when the same row of concrete-filled steel pipe columns 5 are connected and fixed by the support rods 6, the support rods 6 are on the same horizontal line; The support rods 6 between the concrete-filled steel pipe columns 5 are connected and fixed in a horizontal oblique manner, thereby forming an isosceles triangle structure formed between every three concrete-filled steel pipe columns. A stable truss structure is formed to support the roof 4.

The concrete-filled steel pipe roadside support system should start construction at the initial stage of gob-side entry retention, and fill the wall closely following the entryway.

Claims (5)

1. the concrete filled steel tube roadside support system for big cross section gob side entry retaining, it is characterized in that, this system mainly comprises Π section steel beam, the concrete filled steel tube column of roof supporting Π section steel beam, the elliptical ring base being enclosed within concrete filled steel tube column bottom, the inclined hydraulic jack that is hinged support with elliptical ring base of being close to top board, on the vertical Π section steel beam that this inclined hydraulic jack termination is supported on filled wall surface and wire lath;

Described concrete filled steel tube column comprises 8 cun of isometric steel pipes and 5 cun of steel pipes, and 5 cun of steel pipe sockets are in 8 cun of steel pipes, and two steel pipe axle center are identical; Weld 2 ~ 3 cross reinforcements at steel pipe two ends respectively and fix two steel pipes, cross reinforcement one end is welded on 8 cun of steel pipe inner walls, and the other end is welded on 5 cun of outer wall of steel pipe, to fix two steel pipes; Multiple ring type pipe clamp is fixed with at 8 cun of outer surface of steel tube; In 5 cun of steel pipes of distance steel pipe one end 0.3m, install rubber stopper, this rubber stopper diameter mates with 5 cun of pipe diameters, and for blocking 5 cun of steel pipes, then fill concrete in the other end 5 cun of steel pipes and between 8 cun of steel pipes and 5 cun of steel pipes, guarantees inner closely knit;

Described concrete filled steel tube column upper end is provided with vertical hydraulic jack, its top cover contacts with top board Π section steel beam, for roof supporting Π section steel beam, its column casing inserts in concrete filled steel tube column 5 cun of steel pipes without slip casting section, this column casing external diameter and 5 cun of pipe diameters match, and ensure that column casing inserts in 5 cun of steel pipes and rock without waving after slip casting section;

Described concrete filled steel tube column is being arranged as two rows near filled wall side along tunnel trend, and an array pitch is 700 × 500mm, and staggered step type is arranged; Near row's column distance filled wall 250mm of filled wall side, the top board Π section steel beam be arranged on this row's column is " fourth " font, two adjacent upright upper end vertical hydraulic jack top cover support is at " fourth " font top board Π section steel beam two ends, and the vertical Π section steel beam upper end of its 3rd end and filled wall is hinged; Distance filled wall row's column upper plate farthest all arranges " one " font Π section steel beam;

Support bar is all adopted to be connected and fixed between described concrete filled steel tube column, described ring type pipe clamp is circular steel plate, its edge is provided with 4 and moves close to somebody's ear, move close to somebody's ear all to be drilled with circular hole, pass for bolt, the moving close to somebody's ear of circular steel plate edge can embed the draw-in groove at described support bar two ends, and erection bolt is fixed, thus is linked together by two concrete filled steel tube columns;

Wherein, described filled wall surface integral is equipped with wire lath, a Π section steel beam is vertically arranged at interval of a determining deviation again along filled wall length direction, the Π section steel beam of the upper end on filled wall and top board is hinged, vertical Π section steel beam spacing is identical with concrete filled steel tube column spacing, vertical Π section steel beam length is consistent with filled wall height, and it is online to be pressed on filled wall surface metal;

Described elliptical ring base sheath in this row steel tube concrete column bottom far away apart from filled wall, and contacts with roadway floor, described elliptical ring base comprises elliptical ring chassis, tubulose termination, moves close to somebody's ear and bolt, elliptical ring chassis outline is elliptical shape, and Internal periphery is that also arranged off-centre is in transverse side for circle, and its diameter mates with 8 cun of outer diameter of steel pipes, tubulose termination is short steel pipes, and its internal diameter mates with 8 cun of outer diameter of steel pipes, aligns with elliptical ring chassis upper inner wheel exterior feature in tubulose termination, and is welded on elliptical ring chassis, for being inserted in concrete filled steel tube column, described tubulose termination is welded with a pair and moves close to somebody's ear, this moves close to somebody's ear to extend to this major axis opposite side along transverse, move close to somebody's ear to be provided with hole, this is embedded to moving close to somebody's ear centre bottom described inclined hydraulic jack, described bolt is fixed moving close to somebody's ear through this hole and this, form articulated structure, described inclined hydraulic jack other end inclined shore is on the vertical Π section steel beam on described filled wall surface, when roof pressure is excessive, the downward compressive strain of described filled wall, inclined hydraulic jack end can be rotated down, to ensure there are enough support forces to filled wall, prevent filled wall pressure break slabbing or shift near in lane.

2. concrete filled steel tube roadside support system according to claim 1, it is characterized in that, do not fix between described concrete filled steel tube column and described elliptical ring base, under roof pressure effect, described concrete filled steel tube column is in bundle end process, and described elliptical ring base is unaffected.

3. concrete filled steel tube roadside support system according to claim 2, is characterized in that, keeps a determining deviation between described multiple ring type pipe clamp, and the quantity of described multiple ring type pipe clamp and spacing are determined according to 8 cun of steel pipe length.

4. concrete filled steel tube roadside support system according to claim 3, is characterized in that, is stretched by described vertical hydraulic jack column casing, and to adapt to the roof timbering of different head-room, flexible adjustable extent is within 0.3m.

5. concrete filled steel tube roadside support system according to claim 4, is characterized in that, described support bar arrangement is: when adopting support bar to be connected and fixed between the concrete filled steel tube column of same row, and support bar is on same level line; Arrange owing to adopting staggered step type between two row steel tube concrete columns, when between two row steel tube concrete columns, support bar is connected and fixed, connect in horizontal oblique mode, thus form the isosceles triangular structure that between every three concrete filled steel tube columns, support bar is formed, and the trussed construction that final formation one is stable.